cisco 9300 book

cisco 9300 book.To solve this problem while using HSRP, the HSRP interface tracking feature can be used. Interface tracking allows an active routing device to lower the priority of an interface it is tracking when it fails out, thereby allowing another RP to assume the active role. In the example shown in Figure 18.5Chapter 18 Basic Routing 483in Figure 18.5, the RP-B with interface tracking configured will lower its priority, which is equivalent to telling the other routing device that it no longer wants to act as the active routing device. After discovering that the RP.B advertises a lower priority than its own, the RP-A will promote itself to be responsible for handling all traffic sent to the virtual MAC address. The advantage of this approach is that traffic from the user will only go through one RP - RP-AoTo configure interface tracking, execute the following command on the HSRP group interface.Switch(config-if)# standby [group_#] track interface_type interface^ [decrement_valueThe track parameter is used to specify the interface to be allowed to be tracked by HSRPRP. Whenever this interface fails (for whatever reason), the active routing device will lower its HSRP priority by the specified value. Note that decrement_value is optional and defaults to decreasing the priority by 10 if not specified.Verifying HSRPTo see the overall operation of HSRP, use the command show standbyo on the RPSwitch# show standbyVian 1 -Group 1